Note 1 — APPENDIX I

Since the above was written, I have received information from the director of Sudan surveys that a recent extension of the Sudan triangulation-net includes Gebel Furawia as one of the points, and that the precise position found for the summit of the hill is Lat. 15° 20′ 59.9″ N., Long. 23° 36′ 48.1″ E., altitude 954 meters above sea-level. This position differs by about 2 km. from that shown on the map above referred to; but in view of the fact that the distance and bearing of Hassanein Bey’s camp from the hill is unknown, though his observed latitude shows his camp to have been on a parallel about a kilometer and a half north of the hill, I have not thought it worth while to make any change in the adjustment of Hassanein Bey’s data. The longitude adopted for the camp (p. 320) may be slightly in error, but it is unlikely that the error can exceed a mile or so. The difference of level between the top of the hill and Hassanein Bey’s camp being unknown, the triangulation-level affords no control over Hassanein Bey’s barometric value for the latter place, and consequently I have judged it best to use El Fasher as the south control point in adjusting the level-determinations.